Refrigeration unit



FIG. 1 is a front, right perspective view of a refrigeration unit showing our new design;

FIG. 2 is a front, left perspective view thereof;

FIG. 3 is a bottom, right perspective view thereof;

FIG. 4 is a bottom, left perspective view thereof; and,

FIG. 5 is a front view thereof.

The broken lines in the Figures are included for the purpose of illustrating environment and form no part of the claimed design. 

CLAIM The ornamental design for a refrigeration unit, as shown and described. 